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Questions
Since my engine is air cooled, I need the CLT cooleant temperature sensor to measure oil temperatures up to about 120°C. As i was calibrating the NTC resistors for sensors, i was running EasyTherm4.exe .
The generated thermfactor.inc file look like seen below, where ADC values below 17 or temperatures above 215°F (101.7°C)is not represented.
- How do i change the coleant temperature range, so Tbin = Temp in °F , without subtracting 40°F.
- The byte value for the temperature is Tbin = temp in deg. farenhet - 40 this gives maximum temperature Tmax = 255 = 0xFF = 215°F or 101.7°C
- So i thought of changing the Tbin representation to a 1 to 1 representation of temperatures from 0x00 - 0xFF giving 0°F - 255°F or -17.78°C - 123.9°C range.
- So is there an easy way to alter this in the firmware .c files or by config.txt or in my_make ?
- Also thermfactor.inc and matfactor.inc sems to use different failure value, Why ? Is the binary representation the same °F + 40 ?
Part of thermfactor.inc file\n
; Generated using EasyTherm4.exe ; ; Citroen Xantia IAT Sensor ; ; File generated for use with stock 2490 ohm resistor at R7 ; ; Steinhart-Hart coefficients: A= 1,533831E-03 B=1,99258E-04 C= 6,960201E-07 ; ; Input Data Temp, degC Resistance ; 0 5000 ; 25 2000 ; 100 190 ; THERMFACTOR: ; ADC Temp, degF DB 210T ; 0 Sensor Failure - use 170 degF as default DB 255T ; 1 442,07 DB 255T ; 2 379,44 DB 255T ; 3 345,56 DB 255T ; 4 322,57 DB 255T ; 5 305,26 DB 255T ; 6 291,43 DB 255T ; 7 279,93 DB 255T ; 8 270,10 DB 255T ; 9 261,54 DB 255T ; 10 253,94 DB 255T ; 11 247,13 DB 255T ; 12 240,95 DB 255T ; 13 235,29 DB 255T ; 14 230,08 DB 255T ; 15 225,25 DB 255T ; 16 220,75 DB 255T ; 17 216,54 DB 253T ; 18 212,57 DB 249T ; 19 208,83 DB 245T ; 20 205,29 DB 242T ; 21 201,92
Part of matfactor.inc file\n
; Generated using EasyTherm4.exe, ; ; NTC from Web Shop ; ; File generated for use with stock 2490 ohm resistor at R4 ; ; Steinhart-Hart coefficients: A= 1,765869E-03 B=1,611974E-04 C= 8,451341E-07 ; ; Input Data Temp, degC Resistance ; 0 5000 ; 24 2020 ; 100 150 ; MATFACTOR: ; ADC Temp, degF DB 100T ; 0 Sensor Failure - 100% applied DB 255T ; 1 379,93 DB 255T ; 2 333,78 DB 255T ; 3 307,89 DB 255T ; 4 289,90 DB 255T ; 5 276,14 DB 255T ; 6 265,00 DB 255T ; 7 255,65 DB 255T ; 8 247,59 DB 255T ; 9 240,50 DB 255T ; 10 234,18 DB 255T ; 11 228,47 DB 255T ; 12 223,26 DB 255T ; 13 218,48 DB 254T ; 14 214,05 DB 250T ; 15 209,93 DB 246T ; 16 206,07 DB 242T ; 17 202,44 DB 239T ; 18 199,02 DB 236T ; 19 195,78 DB 233T ; 20 192,71 DB 230T ; 21 189,78 DB 227T ; 22 186,98 DB 224T ; 23 184,30
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